I don't think an employee weight loss challenge is necessarily discriminatory to employees who are at their "ideal" weight. I think it's actually insulting to all of their employees. "Hey! So, hey...you guys are pretty fat! Actually, we don't care about you either way, but we might save some money on health insurance costs if you guys lose weight, or get to claim that we are into "promoting wellness," so if you could just lose 10-20 lbs for us, and that will be great. We'll even throw in ONE PAID DAY OFF! It will be great competing with your friends for that. Not exactly an even trade, but you guys won't know the difference, and you get so few perks you'll be willing to participate in this degrading nonsense, and actually thank us for it. So, have fun!" Capitalism is great, ha!